Since these animals always run in packs, never forget to carry your backup magazine. You may need all 24-27 rounds.
I was thinking about getting one of the new Springfield XDS in .45ACP, but it's only a 5+1 single stack. With attacks like this going on, I'm reconsidering.
Look at the XDM in .45 ACP. The compact model has a magazine that increases it's capacity to 13 + 1. The standard mag holds 10. That's enough hot lead to cool the jets of any flash mob.